Washington, June 6 -- Singer-songwriter and pianist Billy Joel opened up about the dark and painful phase of life. After the premiere of his new documentary, Billy Joel: And So It Goes, at the Tribeca Festival, the ace musician shared that he underwent two suicide attempts and fell into a coma after he had an affair with his former bandmate's wife.

In his early 20s, Joel was in a band called Attila with his best friend Jon Small. At the time, he moved in with Small, Elizabeth Weber -- Small's wife -- and their son, reported People.

"Bill and I spent a lot of time together," Elizabeth said in the documentary, adding that it was a "slow build." Then, Small realised something was up and Joel came to him with the truth: "I'm in love with yo...